see this help article for additional assistance in OS X Lion.See this help article for additional assistance in OS X Mountain Lion.See this help article for additional assistance in OS X Mavericks.If you are seeing issues with an application unexpectedly quitting in just one account : If you're using a version of OS X Lion earlier than 10.7.4, see this article for assistance. Make sure you're using the most recent version of Mac OS X. If you are just seeing the issue in one account, you most likely do not need to reinstall any apps. Mac OS X: How to troubleshoot a software issue provides some assistance with this. If you have isolated an issue to a single user account, then you should focus your troubleshooting on that user and specific apps that have symptoms when logged in as that user. If the issue happens in only one user account If you isolate the issue to only your user account, then the article offers the following recommendations: Isolating an issue by using another user account - Apple Support At this point your next step would be to follow the recommendations in the following Knowledge Base article for troubleshooting with an alternate user account: Great job being thorough on troubleshooting the issue and isolating it down to your Mac.
